Very GOOD
Extremely well packaged. Quick shipment. Tool does what it's supposed to do. Bright, clear, easy to read screen. Button on the back not the most convenient placement, but OK. Cannot comment on accuracy of the readings (don't have lab grade equipment), but that's not critical for me. It fits perfectly my needs to compare few chargers in my household. Detects QC3 (Xiaomi charger). Huawei 40w supercharge displayed as unknown, but it doesn't block charger-phone communication. Happy with the purchase.